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Australian planting calendar

What to plant in September in a Cool garden

Explore 79 core planting options for September in the Cool zone, with practical garden jobs and links to our growing guides.

These are broad climate-zone windows. Local weather, frost, soil conditions and your garden’s microclimate can shift timing. Check the plant guide before starting.

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Not sure which zone applies? Find your zone before using this calendar. Want this tailored to your garden? Save your plants in My Garden.

Core planting options

The planting method matters: sowing seed and planting seedlings, tubers or nursery plants are different jobs. “Sow” means the underlying source does not specify direct sowing or trays.

Possible / shoulder planting options

These sit at the edge of the planting window and need more care with local conditions. They are kept separate from the core options.

In the garden in September

Use these jobs when the stated conditions apply in your garden.

Prepare beds and catch weeds early

Add finished compost where spring planting is planned, then remove young weeds before growth accelerates.

When this applies: Wait until soil is workable and avoid compacting wet beds.

Year-round care

Check before watering

Check moisture around the roots and the rain forecast before watering. Water only where needed and follow local watering rules.

When this applies: Use the soil and plant needs to guide watering, rather than a fixed calendar interval.

How to do it

Prepare soil for planting

Before an intended planting, when soil is workable. Preparing a bed does not mean it is time to plant: check the plant’s window for your zone.

Remove young weeds by hand

As unwanted seedlings appear, ideally before flowering and seed set, while soil is moist enough to release roots but not waterlogged.

Check soil texture and pH

Before choosing soil amendments or a permanent planting. Recent lime, fertiliser or compost can distort pH results; follow the test instructions.

Decide whether your plant needs water

Before watering, after useful rain, and more often when plants are young or weather is hot or windy. This is a check, not a fixed watering schedule.

Sources and timing

Planting windows come from The Garden Hand’s existing planting calendar. Follow each plant link for its full growing guide. Garden jobs retain their existing zone, month and condition rules; year-round care is shown separately.